JP3913629B2 - Heat exchanger and heat pump water heater equipped with the heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates primarily heat exchanger and a heat pump water heater including the same that is used in the heat pump water heater.
[0002]
[Prior art]
Conventionally, there are many hot water heaters that use gas or electric heaters as heat sources, but in recent years, heat pump water heaters have been proposed from the viewpoint of efficient use of energy and prevention of fires caused by gas and electric heaters. ing.
[0003]
Such a heat pump water heater is, for example, two units separated into a heat pump unit (hereinafter referred to as an HP unit) having a compressor, an evaporator, an expansion valve, a heat exchanger and the like, and a tank unit having a hot water storage tank. In the condenser, the refrigerant and water are heat-exchanged in a condenser to store hot water so that the hot water can be supplied.
[0004]
Hereinafter, the condenser is referred to as a heat exchanger. As a configuration example of such a heat exchanger, for example, Japanese Patent Laid-Open No. 2002-107069 discloses one as shown in FIG . The heat exchanger 51 includes a refrigerant heat transfer tube (first heat transfer tube) 52 through which refrigerant flows, a water heat transfer tube (second heat transfer tube) 53 through which water flows, and a support member (not shown) that supports these. ing. The refrigerant heat transfer tube 52 and the water heat transfer tube 53 are formed so that the external appearance is flat, and the refrigerant and water flow inside. And the flat surface of the refrigerant | coolant heat exchanger tube 52 and the water heat exchanger tube 53 is match | combined, spirally wound, and these are supported by the support member.
[0005]
FIG. 6 is a front view showing an internal structure of an HP unit in which the heat exchanger is arranged. Since the heat exchanger 51 having such a configuration is spirally stacked and has a cylindrical shape, it has a wide bottom area and a constant height, and occupies a large space in the HP unit 54.
[0006]
[Problems to be solved by the invention]
By the way, the heat pump water heater including the HP unit 54 has been conventionally required to be miniaturized, and the heat exchanger 51 occupying a large space is a cause of increasing the external dimensions of the HP unit 54.
[0007]
The present invention has been made to solve the above-described conventional problems, and provides an improved refrigerant-to-water (or refrigerant-to-heat exchange liquid) heat exchanger and miniaturization. An object of the present invention is to provide a heat pump water heater capable of performing the above-described operation.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of the heat exchanger according to claim 1 includes a first heat transfer tube having a flow path through which the first fluid flows and a second heat transfer tube having a flow path through which the second fluid flows. The first heat transfer tube is embedded and integrated in the second heat transfer tube to form a coupling tube, and the coupling tube is bent into a spiral shape to constitute a heat exchanger body, the heat exchanger body Is characterized by a curved shape .
[0009]
[0010]
[0011]
[0012]
[0013]
[0014]
[0015]
The invention of the heat pump water heater according to claim 2 is characterized in that the heat exchanger according to claim 1 is arranged along the outer peripheral surface of the hot water storage tank.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 is a circuit diagram of a heat pump water heater definitive to an embodiment of the present invention.
[0017]
In FIG. 1, a heat pump water heater 1 includes a compressor 2 that compresses refrigerant, a refrigerant-to-water heat exchanger (hereinafter simply referred to as a heat exchanger) 3 that exchanges heat between the refrigerant and water, and an expansion valve 4 that expands the refrigerant. An evaporator 5 that exchanges heat between the refrigerant and the outside air, an accumulator 6 that performs gas-liquid separation of the refrigerant, and the like, and these components are sequentially connected by a refrigerant heat transfer tube (first heat transfer tube) 7. A refrigerant circulation circuit A, a hot water storage tank 8, a circulation pump 9, and the heat exchanger 3, and a hot water supply circuit B in which these components are sequentially connected by a water heat transfer pipe (second heat transfer pipe) 12; It is composed of And although the said heat pump water heater 1 is normally set as the structure isolate | separated into the heat pump unit 13 and the tank unit 14, as shown in FIG. 4, both units are accommodated in the common exterior case 34, and are integrated. You may let them.
[0018]
[0019]
[0020]
2 and 3, the heat exchanger 3 has a refrigerant heat transfer tube (first heat transfer tube) 7 through which refrigerant flows and a water heat transfer tube (second heat transfer tube) 12 through which water flows. And the three refrigerant | coolant heat exchanger tubes 7, 7, and 7 and the water heat exchanger tube 12 with a larger internal diameter than this refrigerant | coolant heat exchanger tube 7 are produced using the member excellent in workability and heat conductivity like copper as a material. ing. Both ends of the water heat transfer tube 12 are reduced in diameter, and three refrigerant heat transfer tubes 7, 7, 7 are embedded over substantially the entire length excluding both ends. The water heat exchanger tube 12 and the coupling pipe 24 integrated with the refrigerant heat exchanger tube 7, 7, 7 has a predetermined length, as shown in FIG. 2, is wound processed into spiral.
[0021]
[0022]
[0023]
[0024]
[0025]
[0026]
Then, FIG. 4 shows a heat pump water heater 32 which is integral with said heat pump unit 13 and the tank unit 14. The heat pump water heater 32 includes a compressor 2, a heat exchanger 3, an expansion valve, an evaporator 5, a hot water storage tank 8, and a circulation pump 9, and these components are accommodated in an outer case 34. The exterior case 34 is provided with a partition wall 36 that partitions the upper chamber 35A and the lower chamber 35B, and a base 37 as a bottom plate. The compressor 2, the evaporator 5, and the evaporator are provided in the upper chamber 35A. The blower 17 etc. which ventilate to 5 are arrange | positioned, and the heat exchanger 3, the hot water storage tank 8, the circulation pump 9, etc. are arrange | positioned in the lower chamber 35B.
[0027]
The hot water storage tank 8 has a vertically long cylindrical shape in which the upper and lower parts are spherical, and is placed and fixed on the gantry 37 via support legs 8A.
[0028]
The heat exchanger 3 is produced by winding the coupling tube 24 in a spiral shape, and the spiral heat exchanger body is formed to have a curved surface shape that matches the spherical shape of the bottom surface of the hot water storage tank 8. . Then, the hot water storage tank 8 is mounted and fixed on the gantry 37 via a support member 33A.
[0029]
Since the heat exchanger 3 is formed in accordance with the shape of the hot water storage tank 8 as described above, the space is effectively used by arranging it in the space below the hot water storage tank 8. Can be improved. Thereby, size reduction of the heat pump water heater 32 can be achieved.
[0030]
[0031]
Oite the above embodiment, the heat exchanger 3, one is the water heat exchanger tube 12 and have been produced using three coupling pipe 24 which is embedded integrated refrigerant heat exchanger tube 7, 7, 7 of, This coupling tube may be, for example, a single water heat transfer tube 12 and two refrigerant heat transfer tubes 7 and 7 embedded and integrated, and the number of each heat transfer tube is not limited.
[0032]
[0033]
Moreover, although the case where the refrigerant (first fluid) and the water (second fluid) circulate in the heat exchanger 3 and heat exchange between them is described, the present invention describes “refrigerant” and “water”. It is added that it is not limited by.
[0034]
【The invention's effect】
As described above, according to the present invention, the first heat transfer tube is embedded and integrated in the second heat transfer tube to form a coupling tube, and the coupling tube is bent into a spiral shape to constitute the heat exchanger body. Since this heat exchanger body has a curved shape, the volume can be reduced compared to the conventional cylindrical heat exchanger, the storage rate can be improved , and the storage space can be reduced. Since it can be utilized without waste, the heat pump water heater can be miniaturized .
[0035]
[0036]
Then, by downsizing the heat pump water heater, the installation conditions of the heat pump water heater can be improved and the installation location can be easily selected.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a heat pump water heater in an embodiment of the present invention.
FIG. 2 is also a schematic configuration diagram of a heat exchanger .
[3] Also, A heat exchanger of Figure 2 - is a A'sectional view.
FIG. 4 is also a configuration diagram of a heat pump water heater in which a heat pump unit and a tank unit are integrated .
FIG. 5 is a perspective view of a conventional heat exchanger .
FIG. 6 is a front view showing an example of a heat pump unit in which a conventional heat exchanger is arranged .
[Explanation of symbols]
1 (32) Heat pump water heater 3 Refrigerant to water heat exchanger 7 Refrigerant heat transfer tube (first heat transfer tube)
8 Hot water storage tank 12 Water heat transfer pipe (second heat transfer pipe)
24 coupling pipe

Claims (2)

A first heat transfer tube having a flow path through which the first fluid flows; and a second heat transfer tube having a flow path through which the second fluid flows. The first heat transfer tube is embedded and integrated in the second heat transfer tube. A heat exchanger characterized in that a tube is formed and the coupling tube is bent into a spiral shape to constitute a heat exchanger body, and the heat exchanger body has a curved shape . A heat pump water heater, wherein the heat exchanger according to claim 1 is disposed along an outer peripheral surface of a hot water storage tank .

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